<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0,maximum-scale=1.0, user-scalable=0">
  <meta http-equiv="Expires" content="0">
  <meta http-equiv="Pragma" content="no-cache">
  <meta http-equiv="Cache-control" content="no-cache">
  <meta http-equiv="Cache" content="no-cache">
  <link rel="icon" href="data:;base64,=">
  <title>Document</title>
  </head>
  <style>

  .app{
      position: relative;
      width:100%;
      height:100%;
      padding:40px;
      color:white;
      font-size:12px;
      background-color: rgba(0,0,0,.6);
      border-radius:4px;
    }

  </style>
<body>

   <div class="app">
            <h1> welcome  page </h1>
   </div>


</body>
</html>
<script>


new Eng({
   el:'',
})



</script>